alison kosik at the new york stock exchange. >> already down for the dow 117 points. kinding seeing a shift in attitude. if you see what's happening over the last few weeks wall street has been banking on a deal and you can see that in how stocks performed. the s&p 500 is up over the past month. guess what? now wall street is nervous, one analyst says this plan b vote was a litmus test for congress's ability to work out a solution. the way wall street sees it now this is a sign of gridlock. the s&p pa 00 is up 15% so just to put that in perspective, get ready for a tough friday so it's hardly time to panic. the sell-off won't last through the end of the day so they're more optimistic. >> could a sell-off influence washington to get something done? >> a sell-off could be a wake-up call for congress, just out playing chicken with the economy and it has worked before. you look at 2008, stock sold off after the house initially rejected a bank bailout. congress came around and passed it. it may take a direct hit to give lawmakers a kick in the butt especially since we've b